Heating resistor type air flow rate measuring device and method of correcting measurement error

摘要

This invention relates to a measurement error attributable to intake air pulsation of a heating resistor type air flow rate measuring device is corrected. A measurement error correction method not dependent on an intake system of a vehicle is provided. An output from a sensing circuit (100) is sampled at prescribed time intervals. Output values thus sampled are successively converted to flow rate values. A first flow rate value is determined by averaging the flow rate values thus obtained in a prescribed amount of time. Separately, the output from the sensing circuit (100) is averaged for a prescribed amount of time. The average output value thus obtained is converted to a second flow rate value. A correction value for correcting a measurement error is determined based on a difference between the first and second flow rate values.